Heat-coil.



PATENTED APR. 23, 1907.

A. H. ADAMS.

HEAT COIL.

APPLICATION FILED OCT. 9. 1905.

Ew/ W v m ZZZZ m f m i w m W ZQZZ n- 655 86,

' iently held in position .on the protective apparatus.

M invention contemplates, generally UNITED STATES PATENT OFFICE.

ARTHUR H. ADAMS, OF NEW YORK, N Y., ASSIGNOR TO WESTERN ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

HEAT-COIL.

Specification of Letters Patent.

Patented. April 23, 1907.

Application filed October 9.1905. Serial No. 281,932.

To all whom/ it may concern.-

Be it known that I, ARTHUR H. Animus, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Heat-Coils, of which the following is a full clear, concise, and exact description.

My invention relates to, heat-coil protect.- ive devices for electrical circuits, and has for its object the provision of a reversible heatcoil and, means whereby it may be convenspea ing, means by which a reversible heatcartridge may be conveniently held in place on the ordinary protector-strip, thus rendering it possible to use with standard apparatus, designed more particularly for non-reversible heat-coils, those of either reversible or non-reversible type.

Considered more specifically, my invention consists in providing a cap for the heat-coil, slidable over either end thereof and forming an extension of the same. This cap forms a support for one end of the heat-coil and is itself adapted to be supported 'by a spring of theprotective apparatus. The heat-coil co 0 crating with the cap of my invention conslsts of a hollow spool with a heat-producing winding upon the same and a pin inserted in the spool and secured thereto by a fusible material, so asto project unequal distances from the end of the spool. The cap is slipped over that end of the heat-coil from which the pin projects farther. When the heat-coil is in position on the protective apparatus, the cap is under pressure of a spring tending to push it farther over the spool; but under normal conditions this is prevented by the projecting pin. When an abnormal current passes through the heat-coil, the fusible material melts, and the cap is pressed forward over thespool by the spring pushing the pin throi'ighthe-spool and grounding the current.

When the fusible material cools, it resolders the pin in the core, restoring the'heat-coil to a serviceable condition, so that upon merely reversing it in the cap it is again ready for use.

I will describe my invention more particuthereon.

larly by reference to the accompanying drawings, in which Figure 1 is a side elevation of a series of protective apparatus provided with my invention, parts being broken away to more clearly show the same. Fig. 2 is a front View showing a heat-cartridge equipped with my invention in connection with a protectorstrip, there being a pair of protectors 1nounted on each side of the strip. Fig. 3 is a detail longitudinal section of a heat-cartridge in position in the mounting means of my invention. Fig. 4 is a cross-section on line 4 4 of Fig. 3.

The core or spool a has a coil of heat-producing wire I) wound around it, one end of said wire being secured to the core and the other to a cylinder 0, inclosing the coil and insulated from the core by the hard-rubber disks (1, serving as ends for the drum or cylinder 0. The ends of the core project equal distances from the ends of the drum. The spool a has a central bore within which is inserted a pin 6, secured within the spool by readily-fusible solder f, so that the ends of the pin project unequal distances beyond the ends of the core.

Cooperating with the heat-coil is a metallic cap consisting of a disk g, having'spring-arms 71 extending at right angles thereto and frictionally engaging thecylinder, so as to slide A block 'i of insulating material is secured within the 'cap in proximityto the disk g. This block has an opening therein to receive the lon er end of the pin e. A portion of the bloc t projects through an opening in the disk 9 and constitutes a support 1'.

In using the coil the cap is slipped over that end of the heat-coil from which the pin e projects farther until the end of the pin rests in the opening of the block '5. bined cap and coil is then placed in position between the springs kl of a protective apparatus of the well-known form shown in the drawings, the support 7' resting in the slot 'm of the spring I. The spring Z resses inward against the disk g, and one en of the spool a bears against the spring k. The pin 6 asses through. an opening in the spring lc a bears against the spring n.

When the heat-coil is, in positionon the protective apparatus, as above described, a

The comcircuit is completed between the spring Z and springs 7c and a through disk 9, cylinder 0,

winding 5, spool a, and pin e. If a current of sufiicient strength to be injurious to the apparatus with which the protective device is used pass through the heat-coil, the copper core a will become heated sufiiciently to fuse the solder f. The pin is then free to move in the spool, and the pressure of spring Z against disk 9 will force the cap farther over the cylinder a, as shown in dotted lines in i ig. 3, until the pin c forces the spring a in contact with the plate 0 and grounds the line in the usual manner.

When the solder becomes cool, it resets and reunites the pin 0 to the corec, with the ends of the pin projecting at unequal distances in a reversed position therefrom. By the operation of the coil, therefore, the position of the pin in the core is merely reversed, and by removing the cap and sli p ping it over the other end of the coil the device may be used as before.

Since the heat-coil and its cooperating cap are distinct, should either part become defective it may be readily renewed without necessitating the renewal of the other.

What i claim is- 1. In a protector for electrical circuits, a heat-coil having a slidahle pin adapted to project from eitherend thereof,"- of a cap slidably engaging said heat-coil to bear against said pin, said heat-coil being reversible in said cap.

2. In a protector for electrical circuits, a heat-coil cartridge comprising a spool, a heating conductor for said spool, a slidable member passing through the spool and adapted to project at either end thereof, means for normally 'fastening said member to the spool, and a cap slidably engaging said spool and bearing'against said slidable member to actuate the same under abnormal conditions.

3. In a protector for electrical circuits, the combination with a heat-coil having a pin projecting from the end thereof, of a capcomprising a disk having spring-arms adapted to slidably engage said heat-coil, and a disk of insulating material secured within the cap and having an opening for receiving the projecting end of the pi n- 4. In a protector for electrical circuits, a heat-coil cartridge comprising a spool, aheating-conductor for said spool, a pin passing through the spool and adapted to project at either end thereof, fusible material fastening said pin to the spool, and a ca adapted to slide over either end of the spoo and bear against the projecting end of the pin to actuate the same under abnormal conditions, whereby one operation places said cartridge in condition to be reversed in said cap.

5. In a heat-coil, the combination with a hollow spool, of a heat-producing coil wound thereon, one end of which is secured to said spool, a drum inclosing the heat-producing coil and. to which the other end of the heatproducing coil is secured, a pin extending through the spool with its ends projecting unequal distances, fusible material securing the pin to the spool, a cap slidably mounted on the drum and receiving in an insulated bearing the longer projecting end of the pin, and means for sliding the cap over the heat-coil, under abnormal conditions, to reverse the distanceswhich the pin projects from the ends of the spool, and thereby controlling. a circuit. j

6. lln a protector for electrical currents, the combination with a protector-strip, of a heat-cartridge and a support for one end of said cartridge, said support being constructed to engage said strip and being reversible with relation to said cartridge.

7. The combination with a protector-strip and a reversible heat-cartridge therefor, of separate means ,forming a support for one end of said cartridge, said means having a portion constructed to engage with said protector-strip, and said heat cartridge being reversible with relation tosaid supporting means.

S. The combination with a protector-strip, of an attachment for heat-cartridges com prising a portion constructed to engage a heat-cartridge and a portion for engagement with said protector-strip, the ends or" saidheat-cartridge being reversible with relation to said attachment after each operation of the cartridge.

9. In a protector for electrical currents, the combination with a heat-cartridge, of a reversible mounting-cap having spring-arins adapted to slidably engage said heat; car- I tridge.

In witness whereof I hereunto subscribe my name this 25th day of July, A, D. 1905.

ARTHUR H. ADAMS Vl/ itnesses:

Wit J. Burr, RU'reEn VAN Bnun'r. 

